Lightning to phono. It works even on 2016 SE like yours and mine. Solutions exist.
Edit: either lightning to phono plug, or lightning to phono jack. Or even Bellkin's lightning to phono jack+lightning jack for audio and charging. Sure, a little more ridiculous, but still doable.
Lightning to 3.5 mm Audio Cable (1.2m) - Black
Apple Store Search Results
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View attachment 1955144
Lightning to 3.5 mm Headphone Jack Adapter
Apple Store Search Results
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Belkin 3.5 mm Audio + Charge Rockstar
The Belkin 3.5 mm Audio + Charge RockStar offers dual functionality for charging and listening to your iPhone or iPad. Buy online now at apple.com.
store.apple.com
View attachment 1955148